I started with the core, but that was back in the 90s.
There are cases to be made for starting with either Symphony of the Sword No. 1 or Twilight. I'd recommend reading Twilight before Symphony of the Sword No. 2 since it sets up some cosmology.
An alternative would be to start with Aegis Florea 1, Star-Crossed, then read Manhunt, and Crossroads then Aegis Florea 2 before Twilight. Crossroads is part of the original core and could do with a re-write but this order sets up Gryphon's arc with Kei before delving into the younger generation.
D for Drakensis
You're only young once, but immaturity is forever.
There are cases to be made for starting with either Symphony of the Sword No. 1 or Twilight. I'd recommend reading Twilight before Symphony of the Sword No. 2 since it sets up some cosmology.
An alternative would be to start with Aegis Florea 1, Star-Crossed, then read Manhunt, and Crossroads then Aegis Florea 2 before Twilight. Crossroads is part of the original core and could do with a re-write but this order sets up Gryphon's arc with Kei before delving into the younger generation.
D for Drakensis
You're only young once, but immaturity is forever.